How to select all child div with same class using Puppeteer?

问题

I'm new for Puppeteer and I'm trying to get textContent from two divs that using same class.

<div class="post-item">
   <div class="post-item-info">
      <span class="post-item-status post-comment"></span>
      3
   </div>
   <div class="post-item-info">
      <span class="post-item-status post-vote"></span>
      5
   </div>
</div>

The result that I'm expecting is return an array [3,5]. My current code is below.

let postInfo = element.querySelector('.post-item-info');

The problem is it is only return the first one. Please let me know how to do it.

回答1:

Your selector should be like const nodes = element.querySelectorAll('.post-item-info');. Then to access individual items in the returned collection, use a traditional for loop like

for(let i = 0; i < nodes.length; i++){
      const currentNode = nodes[i];
      // doStuffWith(currentNode);
    }

回答2:

Well, there's a similar method for that querySelectorAll()

const nodes = document.querySelectorAll('.post-item-info')

Array.from(nodes).forEach(node => {
  // do stuff with node
})

回答3:

Some concise ways to get the array of these text contents:

   const texts = await page.$$eval('.post-item-info',
     divs => divs.map(({ innerText }) => innerText));

    const texts = await page.evaluate(() =>
      [...document.querySelectorAll('.post-item-info'')].map(({ innerText }) => innerText));

回答4:

Get them like:

let elements = document.getElementsByClassName('post-item-info')

It returns an array and then you can loop on it. Also, you can see this Github question for the same case:

https://github.com/GoogleChrome/puppeteer/issues/461

来源：https://stackoverflow.com/questions/54677126/how-to-select-all-child-div-with-same-class-using-puppeteer

标签

javascript

node.js

Puppeteer